(x^2+3x+2)(4x^2+8x+3)-90
=(x+2)(x+1)(2x+1)(2x+3)-90
=(x+2)(2x+1)(x+1)(2x+3)-90
=(2x^2+5x+2)(2x^2+5x+3)-90
令t=2x^2+5x
原式=(t+2)(t+3)-90
=(t+2)(t+2+1)-90
=(t+2)^2+(t+2)-90
=(t+2+10)(t+2-9)
=(t+12)(t-7)
=(2x^2+5x+12)(2x^2+5x-7)
=(2x^2+5x+12)(2x+7)(x-1)
因式分解:(x^2+3x+2)(4x^2+8x+3)-90用换元法
因式分解:(x^2+3x+2)(4x^2+8x+3)-90用换元法
数学人气:259 ℃时间:2019-08-20 21:29:34
优质解答
我来回答
类似推荐
猜你喜欢
- 137.2×9.9+3.72这道题的简便计算怎么算?请列式.并说出方法
- 2修路队修一条路,5天修了这条路的2/9,照这样的速度,修完这条路还需要多少天?
- 3求高一数学必修三知识点
- 4描写母亲的词语
- 5______ it is you’ve found, you must give it back to the person it belongs to.
- 6EA是圆O切线,A为切点,弦BC交OA于D,过B作PB垂直CB交EA延长线于P,求证:AC平行PD
- 7500字 关于创城的作文
- 8英语作文:what have you done for your family during the summer vacation?If not,waht will you do?
- 9用12个棱长是一厘米的小正方体摆成一个长方体.有几种不同的摆法?摆成的长方体的长、宽、高各是多少?
- 10取标准状况下CH4和过量O2的混合气体840mL点燃,将燃烧后的气体用过量碱石灰吸收,碱石灰增量0.6g.